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Graphite box, also called graphite square crucible, graphite sagger, can be used in the sintering process of negative electrode materials or positive electrode materials in the lithium battery industry. It is mainly used as a container for carrying powder, and it is used when it is placed in a furnace for heating. It has a longer service life when used in an inert gas environment. Generally, according to the type of kiln, the matching bottom plate and cover plate are customized. In recent years, it has been widely used by lithium battery lithium iron phosphate enterprises and high-temperature furnace enterprises.
When purchasing graphite sagger crucibles and graphite boxes for lithium iron phosphate factories, customers should focus on the performance and consistency of the graphite materials used, because it affects the service life and use effect of the boxes. The graphite saggers supplied by our company include ordinary Graphite and high-purity graphite are two materials. The sagger made of high-purity graphite does not deform under high temperature, is resistant to oxidation, has good air permeability, fast impurity volatilization, high sintering yield, less pollution, and longer service life; Ordinary Graphite sagger saves procurement costs in the short term. Our company can match the most suitable graphite material according to the specific application requirements and budget of customers.
According to the different quality requirements of negative electrode materials, it can be divided into low-temperature materials (2800℃), medium-temperature materials (2950℃), and high-temperature materials (3000℃). However, the high-temperature treatment process of graphitization is generally between 2250-3000℃. Each position has reached the required temperature, and it needs to be kept in the high temperature process for a period of time to ensure that the temperature in the furnace is uniform. Under normal circumstances, due to different furnace types, the time to be kept is different. Generally, the high temperature lasts for 6-30 hours; during the power transmission process, to prevent the furnace resistance from rebounding, it needs to be kept for 3-6 hours; the specific situation is based on the following three technologies Main points are formulated reasonably
The basis for formulating the power curve during the power transmission process of the negative electrode material:
1) Select different heating curves according to the furnace core, negative electrode material, resistance material, graphite crucible, furnace loading, etc.
2) Select different heating curves according to the volatile content of the negative electrode material and resistance material in the furnace. For example, when the volatile content is high, choose a slower heating curve; otherwise, choose a faster heating curve
3) When the ash content of the anode material and resistance material in the furnace is high or the anode material is relatively difficult to graphitize, it is necessary to appropriately extend the high-power power transmission time.
When putting the graphite crucible into the negative electrode material graphitization furnace, the old and new crucibles cannot be put into the furnace at the same time, because when the negative electrode resistance material in the furnace is unevenly distributed, the current will flow from the place with low resistance, and bias current will occur, which will affect the graphitization of the whole furnace. Effect. In this regard, the graphite product quality supervision and inspection center gives the following 3 points for attention in furnace loading
1) When loading the furnace, the resistance material needs to be discharged in a long line from the head of the furnace chamber to the tail of the furnace chamber to avoid the concentration of small or large particles
2) When the old and new crucibles are loaded into the same furnace, they must be properly matched, avoiding the installation method of one layer of new crucibles and one layer of old crucibles.
3) Prevent the resistance material from leaking into the side wall material
For graphitization purpose, when negative electrode material load into the furnace, attention must be paid to the matching of volatile matter, because when the temperature in the furnace rises to 200-1000 degrees, the negative electrode in the furnace will emit a large amount of volatile matter. Furnace safety accidents; or when a large amount of volatile matter escapes, insufficient combustion will produce a large amount of black smoke, causing environmental pollution or environmental protection accidents.
1) When the negative electrode is loaded into the furnace, it is necessary to make a reasonable match according to the level of volatile matter content, so as to avoid excessive concentration and concentrated escape of high volatile matter parts during power transmission.
2) Appropriate ventilation holes should be set on the top insulation material to facilitate the effective escape of volatile matter
3) When designing the power transmission curve, it is necessary to fully consider the stage of concentrated discharge of volatile matter, and the power transmission curve should be appropriately slowed down so that the volatile matter can be discharged slowly and fully burned
4) Reasonably select auxiliary materials to ensure the particle size composition of auxiliary materials, and reduce the amount of powder with a particle size of 0-1mm in auxiliary materials, which generally accounts for ≤10%.
During the graphitization process of the negative electrode material, the correct control of the temperature of the crucible when it is cooled out of the furnace can help control the production cycle and production cost; taking out the crucible too early will cause the negative electrode material to oxidize due to excessive temperature and increase the specific surface area. If the crucible is too large, it may also cause oxidation damage to the crucible; taking out the crucible too late will also cause oxidation of the negative electrode material, prolong the production cycle, and increase production costs; it has been tested in practice that about 150 degrees is the best temperature for the crucible to be released from the furnace.
Graphite box, also called graphite square crucible, graphite sagger, can be used in the sintering process of negative electrode materials or positive electrode materials in the lithium battery industry. It is mainly used as a container for carrying powder, and it is used when it is placed in a furnace for heating. It has a longer service life when used in an inert gas environment. Generally, according to the type of kiln, the matching bottom plate and cover plate are customized. In recent years, it has been widely used by lithium battery lithium iron phosphate enterprises and high-temperature furnace enterprises.
When purchasing graphite sagger crucibles and graphite boxes for lithium iron phosphate factories, customers should focus on the performance and consistency of the graphite materials used, because it affects the service life and use effect of the boxes. The graphite saggers supplied by our company include ordinary Graphite and high-purity graphite are two materials. The sagger made of high-purity graphite does not deform under high temperature, is resistant to oxidation, has good air permeability, fast impurity volatilization, high sintering yield, less pollution, and longer service life; Ordinary Graphite sagger saves procurement costs in the short term. Our company can match the most suitable graphite material according to the specific application requirements and budget of customers.
According to the different quality requirements of negative electrode materials, it can be divided into low-temperature materials (2800℃), medium-temperature materials (2950℃), and high-temperature materials (3000℃). However, the high-temperature treatment process of graphitization is generally between 2250-3000℃. Each position has reached the required temperature, and it needs to be kept in the high temperature process for a period of time to ensure that the temperature in the furnace is uniform. Under normal circumstances, due to different furnace types, the time to be kept is different. Generally, the high temperature lasts for 6-30 hours; during the power transmission process, to prevent the furnace resistance from rebounding, it needs to be kept for 3-6 hours; the specific situation is based on the following three technologies Main points are formulated reasonably
The basis for formulating the power curve during the power transmission process of the negative electrode material:
1) Select different heating curves according to the furnace core, negative electrode material, resistance material, graphite crucible, furnace loading, etc.
2) Select different heating curves according to the volatile content of the negative electrode material and resistance material in the furnace. For example, when the volatile content is high, choose a slower heating curve; otherwise, choose a faster heating curve
3) When the ash content of the anode material and resistance material in the furnace is high or the anode material is relatively difficult to graphitize, it is necessary to appropriately extend the high-power power transmission time.
When putting the graphite crucible into the negative electrode material graphitization furnace, the old and new crucibles cannot be put into the furnace at the same time, because when the negative electrode resistance material in the furnace is unevenly distributed, the current will flow from the place with low resistance, and bias current will occur, which will affect the graphitization of the whole furnace. Effect. In this regard, the graphite product quality supervision and inspection center gives the following 3 points for attention in furnace loading
1) When loading the furnace, the resistance material needs to be discharged in a long line from the head of the furnace chamber to the tail of the furnace chamber to avoid the concentration of small or large particles
2) When the old and new crucibles are loaded into the same furnace, they must be properly matched, avoiding the installation method of one layer of new crucibles and one layer of old crucibles.
3) Prevent the resistance material from leaking into the side wall material
For graphitization purpose, when negative electrode material load into the furnace, attention must be paid to the matching of volatile matter, because when the temperature in the furnace rises to 200-1000 degrees, the negative electrode in the furnace will emit a large amount of volatile matter. Furnace safety accidents; or when a large amount of volatile matter escapes, insufficient combustion will produce a large amount of black smoke, causing environmental pollution or environmental protection accidents.
1) When the negative electrode is loaded into the furnace, it is necessary to make a reasonable match according to the level of volatile matter content, so as to avoid excessive concentration and concentrated escape of high volatile matter parts during power transmission.
2) Appropriate ventilation holes should be set on the top insulation material to facilitate the effective escape of volatile matter
3) When designing the power transmission curve, it is necessary to fully consider the stage of concentrated discharge of volatile matter, and the power transmission curve should be appropriately slowed down so that the volatile matter can be discharged slowly and fully burned
4) Reasonably select auxiliary materials to ensure the particle size composition of auxiliary materials, and reduce the amount of powder with a particle size of 0-1mm in auxiliary materials, which generally accounts for ≤10%.
During the graphitization process of the negative electrode material, the correct control of the temperature of the crucible when it is cooled out of the furnace can help control the production cycle and production cost; taking out the crucible too early will cause the negative electrode material to oxidize due to excessive temperature and increase the specific surface area. If the crucible is too large, it may also cause oxidation damage to the crucible; taking out the crucible too late will also cause oxidation of the negative electrode material, prolong the production cycle, and increase production costs; it has been tested in practice that about 150 degrees is the best temperature for the crucible to be released from the furnace.
